Sorry I know this is not the point of your comment, but I couldn't let this go: the Monzo app is by far the slowest app on my phone. Until their more recent updates it was nearly unusable on an iPhone SE. Still has >1sec response times on almost any touch event. (comments on the forum suggest this is because they use O(N) algorithms somewhere, and after 2y worth of events the app slows to a crawl. doesn't inspire confidence, to be honest.)
To the point that I focus on putting as many spends as possible on another card that has a better app, just so I can avoid spending any time in Monzo.
To end on a positive note: their support is so much better than the competition it isn't even funny. Apparently they are the only bank with a "brain required" policy for CS.